Make classes and structures in core/paint fast-allocated.

Source/core/paint/ViewPainter.h

Index: Source/core/paint/ViewPainter.h
diff --git a/Source/core/paint/ViewPainter.h b/Source/core/paint/ViewPainter.h
index 2e26d4852ff0c3c70121b2f13eb2406923380084..015dc7e6912fa6d0ead5ca0e29d4e876f1efba0e 100644
--- a/Source/core/paint/ViewPainter.h
+++ b/Source/core/paint/ViewPainter.h
@@ -5,6 +5,8 @@
 #ifndef ViewPainter_h
 #define ViewPainter_h
 
+#include "wtf/Allocator.h"
+
 namespace blink {
 
 class LayoutPoint;
@@ -13,6 +15,7 @@ class LayoutBox;
 class LayoutView;
 
 class ViewPainter {
+    STACK_ALLOCATED();
 public:
     ViewPainter(LayoutView& layoutView) : m_layoutView(layoutView) { }